We need a LOT more information about what you want to do, and don't get ahead of yourself.
We have created a "Support quick start" in the KB because the official one is outdated:
http://www.symantec.com/business/support/index?page=content&id=HOWTO30267&actp=search&viewlocale=en_US&searchid=1286266292191
This can get you through some basics, but we need to answer a few questions here too.
First, a BACKUP is not what you think. A Backup image will not capture images the same way and will not replicate them at all which can confuse people. A backup image is designed to be just that - a single-point backup of a single workstation that will nto be used for any one else anywhere else.
It's fine for testing capturing of images, but it's not very useful.
Second, Initial Deployment is a means by which unknown computes can receive an image. This is critically important to understand as apposed to known, or managed computers. The advice above to install the agent on a system is to create a managed computer and a job for that computer. If you have new, bare-bones, or whatever systems that you simply want to image "out of the box", this is what Initial Deployment is for.
If your computer is actually already managed, they will never receive the initial deployment menu. NOTE: Once a system has checked into WinPE once, it has that MININT record created... and it is now a known computer. That's right, it is now "known" by the NS, and therefore, on next boot, will not get the initial deployment menu. NOTE: To remove a "known computer" from the console, you have to delete it in the NS, and cycle the pxe/sbs services. This is because the PXE services remember all known systems in RAM "remotely" from the NS and a deleted computer from the console can hardly send an update to the PXE server (yeah, we understand that has to be fixed, but it's not right now). So, if you delete a computer to make it unknown, cycle SBS services - all 4.
hmmm... my report isn't attached. I'll get that when I'm awake tomorro - remind me.
The report is a quick-list of all "MININT" records, along with UUID, Ser#, MAC, IP. This way, for all of you used to managing "new" computers, you can get a quick list of all of those that booted. One at a time is no problem really, but what if you have 5? Yeah, it gets ugly quick.
Remind me.
As for how it's known, the initial question - that's called "Basic Inventory". Now that DS is an integral part of the NS, every time we boot a system, instead of the AClient or DAgent running, we run the Altiris Agent. In WinPE this is called the PECTAgent, but it does essentially the same thing - it's just modified for PE (and probably slightly misnamed, but we'll not go there...).
The Altiris Agent scans the system similar to how the DAgent did, and sends up to the NS "basic inventory" (as opposed to "inventory" which is far more detailed than what DS captured and is culled via "Inventory Solution"). That is what is used to create the computer account in NS which, at the time you are in WinPE is "named" a random generated name starting with MININT.
PS> That MININT name changes with every reboot - including of the same system. Here's the cool thing - if you reboot a MININT record to the NS, the NAME in the console will stay the same, but the name on the client will be different - because after the reboot, the WinPE generated a different random name. Makes it REALLY easy to find in the console. THAT is what initially prompted that report I made, and need to find... It wont take me time once I'm in the office...
Anyway, hope that helps a bit. Keep posting - we'll get you all straightened out!